/proc/self/status format check

* test/ruby/memory_status.rb: use /proc/self/status if it is in
  the expected format.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34856 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Feb 29 13:06:42 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/ruby/memory_status.rb: use /proc/self/status if it is in
+	  the expected format.
+
 Wed Feb 29 06:14:51 2012  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* ext/date/date_core.c: reverted r34825.

test/ruby/memory_status.rb

@@ -3,9 +3,9 @@ module Memory
   vals = []
 
   case
-  when File.exist?(procfile = "/proc/self/status")
+  when File.exist?(procfile = "/proc/self/status") and (pat = /^Vm(\w+):\s+(\d+)/) =~ File.binread(procfile)
     PROC_FILE = procfile
-    VM_PAT = /^Vm(\w+):\s+(\d+)/
+    VM_PAT = pat
     def self.read_status
       IO.foreach(PROC_FILE, encoding: Encoding::ASCII_8BIT) do |l|
         yield($1.downcase.intern, $2.to_i * 1024) if VM_PAT =~ l